[deliverable/linux.git] / arch / s390 / kernel / early.c

/*
 *    Copyright IBM Corp. 2007, 2009
 *    Author(s): Hongjie Yang <hongjie@us.ibm.com>,
 *		 Heiko Carstens <heiko.carstens@de.ibm.com>
 */

#define KMSG_COMPONENT "setup"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/compiler.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/lockdep.h>
#include <linux/module.h>
#include <linux/pfn.h>
#include <linux/uaccess.h>
#include <linux/kernel.h>
#include <asm/ebcdic.h>
#include <asm/ipl.h>
#include <asm/lowcore.h>
#include <asm/processor.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/sysinfo.h>
#include <asm/cpcmd.h>
#include <asm/sclp.h>
#include <asm/facility.h>
#include "entry.h"

/*
 * Create a Kernel NSS if the SAVESYS= parameter is defined
 */
#define DEFSYS_CMD_SIZE		128
#define SAVESYS_CMD_SIZE	32

char kernel_nss_name[NSS_NAME_SIZE + 1];

static void __init setup_boot_command_line(void);

/*
 * Get the TOD clock running.
 */
static void __init reset_tod_clock(void)
{
	u64 time;

	if (store_tod_clock(&time) == 0)
		return;
	/* TOD clock not running. Set the clock to Unix Epoch. */
	if (set_tod_clock(TOD_UNIX_EPOCH) != 0 || store_tod_clock(&time) != 0)
		disabled_wait(0);

	sched_clock_base_cc = TOD_UNIX_EPOCH;
	S390_lowcore.last_update_clock = sched_clock_base_cc;
}

#ifdef CONFIG_SHARED_KERNEL
int __init savesys_ipl_nss(char *cmd, const int cmdlen);

asm(
	"	.section .init.text,\"ax\",@progbits\n"
	"	.align	4\n"
	"	.type	savesys_ipl_nss, @function\n"
	"savesys_ipl_nss:\n"
	"	stmg	6,15,48(15)\n"
	"	lgr	14,3\n"
	"	sam31\n"
	"	diag	2,14,0x8\n"
	"	sam64\n"
	"	lgr	2,14\n"
	"	lmg	6,15,48(15)\n"
	"	br	14\n"
	"	.size	savesys_ipl_nss, .-savesys_ipl_nss\n"
	"	.previous\n");

static __initdata char upper_command_line[COMMAND_LINE_SIZE];

static noinline __init void create_kernel_nss(void)
{
	unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size;
#ifdef CONFIG_BLK_DEV_INITRD
	unsigned int sinitrd_pfn, einitrd_pfn;
#endif
	int response;
	int hlen;
	size_t len;
	char *savesys_ptr;
	char defsys_cmd[DEFSYS_CMD_SIZE];
	char savesys_cmd[SAVESYS_CMD_SIZE];

	/* Do nothing if we are not running under VM */
	if (!MACHINE_IS_VM)
		return;

	/* Convert COMMAND_LINE to upper case */
	for (i = 0; i < strlen(boot_command_line); i++)
		upper_command_line[i] = toupper(boot_command_line[i]);

	savesys_ptr = strstr(upper_command_line, "SAVESYS=");

	if (!savesys_ptr)
		return;

	savesys_ptr += 8;    /* Point to the beginning of the NSS name */
	for (i = 0; i < NSS_NAME_SIZE; i++) {
		if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0')
			break;
		kernel_nss_name[i] = savesys_ptr[i];
	}

	stext_pfn = PFN_DOWN(__pa(&_stext));
	eshared_pfn = PFN_DOWN(__pa(&_eshared));
	end_pfn = PFN_UP(__pa(&_end));
	min_size = end_pfn << 2;

	hlen = snprintf(defsys_cmd, DEFSYS_CMD_SIZE,
			"DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
			kernel_nss_name, stext_pfn - 1, stext_pfn,
			eshared_pfn - 1, eshared_pfn, end_pfn);

#ifdef CONFIG_BLK_DEV_INITRD
	if (INITRD_START && INITRD_SIZE) {
		sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
		einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
		min_size = einitrd_pfn << 2;
		hlen += snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
				 " EW %.5X-%.5X", sinitrd_pfn, einitrd_pfn);
	}
#endif

	snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
		 " EW MINSIZE=%.7iK PARMREGS=0-13", min_size);
	defsys_cmd[DEFSYS_CMD_SIZE - 1] = '\0';
	snprintf(savesys_cmd, SAVESYS_CMD_SIZE, "SAVESYS %s \n IPL %s",
		 kernel_nss_name, kernel_nss_name);
	savesys_cmd[SAVESYS_CMD_SIZE - 1] = '\0';

	__cpcmd(defsys_cmd, NULL, 0, &response);

	if (response != 0) {
		pr_err("Defining the Linux kernel NSS failed with rc=%d\n",
			response);
		kernel_nss_name[0] = '\0';
		return;
	}

	len = strlen(savesys_cmd);
	ASCEBC(savesys_cmd, len);
	response = savesys_ipl_nss(savesys_cmd, len);

	/* On success: response is equal to the command size,
	 *	       max SAVESYS_CMD_SIZE
	 * On error: response contains the numeric portion of cp error message.
	 *	     for SAVESYS it will be >= 263
	 *	     for missing privilege class, it will be 1
	 */
	if (response > SAVESYS_CMD_SIZE || response == 1) {
		pr_err("Saving the Linux kernel NSS failed with rc=%d\n",
			response);
		kernel_nss_name[0] = '\0';
		return;
	}

	/* re-initialize cputime accounting. */
	sched_clock_base_cc = get_tod_clock();
	S390_lowcore.last_update_clock = sched_clock_base_cc;
	S390_lowcore.last_update_timer = 0x7fffffffffffffffULL;
	S390_lowcore.user_timer = 0;
	S390_lowcore.system_timer = 0;
	asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer));

	/* re-setup boot command line with new ipl vm parms */
	ipl_update_parameters();
	setup_boot_command_line();

	ipl_flags = IPL_NSS_VALID;
}

#else /* CONFIG_SHARED_KERNEL */

static inline void create_kernel_nss(void) { }

#endif /* CONFIG_SHARED_KERNEL */

/*
 * Clear bss memory
 */
static noinline __init void clear_bss_section(void)
{
	memset(__bss_start, 0, __bss_stop - __bss_start);
}

/*
 * Initialize storage key for kernel pages
 */
static noinline __init void init_kernel_storage_key(void)
{
#if PAGE_DEFAULT_KEY
	unsigned long end_pfn, init_pfn;

	end_pfn = PFN_UP(__pa(&_end));

	for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
		page_set_storage_key(init_pfn << PAGE_SHIFT,
				     PAGE_DEFAULT_KEY, 0);
#endif
}

static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);

static noinline __init void detect_machine_type(void)
{
	struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page;

	/* Check current-configuration-level */
	if (stsi(NULL, 0, 0, 0) <= 2) {
		S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
		return;
	}
	/* Get virtual-machine cpu information. */
	if (stsi(vmms, 3, 2, 2) || !vmms->count)
		return;

	/* Running under KVM? If not we assume z/VM */
	if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
		S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
	else
		S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
}

static __init void setup_topology(void)
{
	int max_mnest;

	if (!test_facility(11))
		return;
	S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY;
	for (max_mnest = 6; max_mnest > 1; max_mnest--) {
		if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
			break;
	}
	topology_max_mnest = max_mnest;
}

static void early_pgm_check_handler(void)
{
	const struct exception_table_entry *fixup;
	unsigned long cr0, cr0_new;
	unsigned long addr;

	addr = S390_lowcore.program_old_psw.addr;
	fixup = search_exception_tables(addr & PSW_ADDR_INSN);
	if (!fixup)
		disabled_wait(0);
	/* Disable low address protection before storing into lowcore. */
	__ctl_store(cr0, 0, 0);
	cr0_new = cr0 & ~(1UL << 28);
	__ctl_load(cr0_new, 0, 0);
	S390_lowcore.program_old_psw.addr = extable_fixup(fixup)|PSW_ADDR_AMODE;
	__ctl_load(cr0, 0, 0);
}

static noinline __init void setup_lowcore_early(void)
{
	psw_t psw;

	psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA;
	psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler;
	S390_lowcore.external_new_psw = psw;
	psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
	S390_lowcore.program_new_psw = psw;
	s390_base_pgm_handler_fn = early_pgm_check_handler;
}

static noinline __init void setup_facility_list(void)
{
	stfle(S390_lowcore.stfle_fac_list,
	      ARRAY_SIZE(S390_lowcore.stfle_fac_list));
}

static __init void detect_diag9c(void)
{
	unsigned int cpu_address;
	int rc;

	cpu_address = stap();
	asm volatile(
		"	diag	%2,0,0x9c\n"
		"0:	la	%0,0\n"
		"1:\n"
		EX_TABLE(0b,1b)
		: "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
	if (!rc)
		S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
}

static __init void detect_diag44(void)
{
	int rc;

	asm volatile(
		"	diag	0,0,0x44\n"
		"0:	la	%0,0\n"
		"1:\n"
		EX_TABLE(0b,1b)
		: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
	if (!rc)
		S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44;
}

static __init void detect_machine_facilities(void)
{
	if (test_facility(8)) {
		S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1;
		__ctl_set_bit(0, 23);
	}
	if (test_facility(78))
		S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
	if (test_facility(3))
		S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
	if (test_facility(40))
		S390_lowcore.machine_flags |= MACHINE_FLAG_LPP;
	if (test_facility(50) && test_facility(73))
		S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
	if (test_facility(51))
		S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC;
	if (test_facility(129))
		S390_lowcore.machine_flags |= MACHINE_FLAG_VX;
}

static int __init cad_setup(char *str)
{
	int val;

	get_option(&str, &val);
	if (val && test_facility(128))
		S390_lowcore.machine_flags |= MACHINE_FLAG_CAD;
	return 0;
}
early_param("cad", cad_setup);

static int __init cad_init(void)
{
	if (MACHINE_HAS_CAD)
		/* Enable problem state CAD. */
		__ctl_set_bit(2, 3);
	return 0;
}
early_initcall(cad_init);

static __init void rescue_initrd(void)
{
#ifdef CONFIG_BLK_DEV_INITRD
	unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20);
	/*
	 * Just like in case of IPL from VM reader we make sure there is a
	 * gap of 4MB between end of kernel and start of initrd.
	 * That way we can also be sure that saving an NSS will succeed,
	 * which however only requires different segments.
	 */
	if (!INITRD_START || !INITRD_SIZE)
		return;
	if (INITRD_START >= min_initrd_addr)
		return;
	memmove((void *) min_initrd_addr, (void *) INITRD_START, INITRD_SIZE);
	INITRD_START = min_initrd_addr;
#endif
}

/* Set up boot command line */
static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t))
{
	char *parm, *delim;
	size_t rc, len;

	len = strlen(boot_command_line);

	delim = boot_command_line + len;	/* '\0' character position */
	parm  = boot_command_line + len + 1;	/* append right after '\0' */

	rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
	if (rc) {
		if (*parm == '=')
			memmove(boot_command_line, parm + 1, rc);
		else
			*delim = ' ';		/* replace '\0' with space */
	}
}

static inline int has_ebcdic_char(const char *str)
{
	int i;

	for (i = 0; str[i]; i++)
		if (str[i] & 0x80)
			return 1;
	return 0;
}

static void __init setup_boot_command_line(void)
{
	COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0;
	/* convert arch command line to ascii if necessary */
	if (has_ebcdic_char(COMMAND_LINE))
		EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
	/* copy arch command line */
	strlcpy(boot_command_line, strstrip(COMMAND_LINE),
		ARCH_COMMAND_LINE_SIZE);

	/* append IPL PARM data to the boot command line */
	if (MACHINE_IS_VM)
		append_to_cmdline(append_ipl_vmparm);

	append_to_cmdline(append_ipl_scpdata);
}

/*
 * Save ipl parameters, clear bss memory, initialize storage keys
 * and create a kernel NSS at startup if the SAVESYS= parm is defined
 */
void __init startup_init(void)
{
	reset_tod_clock();
	ipl_save_parameters();
	rescue_initrd();
	clear_bss_section();
	init_kernel_storage_key();
	lockdep_init();
	lockdep_off();
	setup_lowcore_early();
	setup_facility_list();
	detect_machine_type();
	ipl_update_parameters();
	setup_boot_command_line();
	create_kernel_nss();
	detect_diag9c();
	detect_diag44();
	detect_machine_facilities();
	setup_topology();
	sclp_early_detect();
	lockdep_on();
}
Commit	Line	Data
ab14de6c	1	/*
155af2f9	2	* Copyright IBM Corp. 2007, 2009
ab14de6c HC	3	* Author(s): Hongjie Yang <hongjie@us.ibm.com>,
	4	* Heiko Carstens <heiko.carstens@de.ibm.com>
	5	*/
	6
11af97e1 HB	7	#define KMSG_COMPONENT "setup"
	8	#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
	9
92e6ecf3	10	#include <linux/compiler.h>
ab14de6c HC	11	#include <linux/init.h>
	12	#include <linux/errno.h>
	13	#include <linux/string.h>
	14	#include <linux/ctype.h>
	15	#include <linux/lockdep.h>
	16	#include <linux/module.h>
	17	#include <linux/pfn.h>
	18	#include <linux/uaccess.h>
11af97e1	19	#include <linux/kernel.h>
a0443fbb	20	#include <asm/ebcdic.h>
46b05d26	21	#include <asm/ipl.h>
ab14de6c HC	22	#include <asm/lowcore.h>
	23	#include <asm/processor.h>
	24	#include <asm/sections.h>
	25	#include <asm/setup.h>
92e6ecf3	26	#include <asm/sysinfo.h>
ab14de6c HC	27	#include <asm/cpcmd.h>
ab14de6c HC	28	#include <asm/sclp.h>
a0616cde	29	#include <asm/facility.h>
a806170e	30	#include "entry.h"
ab14de6c HC	31
	32	/*
	33	* Create a Kernel NSS if the SAVESYS= parameter is defined
	34	*/
a0443fbb	35	#define DEFSYS_CMD_SIZE 128
ab14de6c HC	36	#define SAVESYS_CMD_SIZE 32
ab14de6c HC	37
ab14de6c HC	38	char kernel_nss_name[NSS_NAME_SIZE + 1];
ab14de6c HC	39
a0443fbb HB	40	static void __init setup_boot_command_line(void);
a0443fbb HB	41
b6112ccb MS	42	/*
	43	* Get the TOD clock running.
	44	*/
	45	static void __init reset_tod_clock(void)
	46	{
	47	u64 time;
	48
1aae0560	49	if (store_tod_clock(&time) == 0)
b6112ccb MS	50	return;
b6112ccb MS	51	/* TOD clock not running. Set the clock to Unix Epoch. */
1aae0560	52	if (set_tod_clock(TOD_UNIX_EPOCH) != 0 \|\| store_tod_clock(&time) != 0)
b6112ccb MS	53	disabled_wait(0);
	54
	55	sched_clock_base_cc = TOD_UNIX_EPOCH;
b89031e0	56	S390_lowcore.last_update_clock = sched_clock_base_cc;
b6112ccb	57	}
a0443fbb	58
ab14de6c	59	#ifdef CONFIG_SHARED_KERNEL
a0443fbb HB	60	int __init savesys_ipl_nss(char *cmd, const int cmdlen);
	61
	62	asm(
	63	" .section .init.text,\"ax\",@progbits\n"
	64	" .align 4\n"
	65	" .type savesys_ipl_nss, @function\n"
	66	"savesys_ipl_nss:\n"
a0443fbb HB	67	" stmg 6,15,48(15)\n"
	68	" lgr 14,3\n"
	69	" sam31\n"
	70	" diag 2,14,0x8\n"
	71	" sam64\n"
	72	" lgr 2,14\n"
	73	" lmg 6,15,48(15)\n"
a0443fbb	74	" br 14\n"
18764463 HC	75	" .size savesys_ipl_nss, .-savesys_ipl_nss\n"
18764463 HC	76	" .previous\n");
a0443fbb	77
684d2fd4 HB	78	static __initdata char upper_command_line[COMMAND_LINE_SIZE];
684d2fd4 HB	79
ab14de6c HC	80	static noinline __init void create_kernel_nss(void)
	81	{
	82	unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size;
	83	#ifdef CONFIG_BLK_DEV_INITRD
	84	unsigned int sinitrd_pfn, einitrd_pfn;
	85	#endif
	86	int response;
69ac43b0	87	int hlen;
a0443fbb	88	size_t len;
ab14de6c	89	char *savesys_ptr;
ab14de6c HC	90	char defsys_cmd[DEFSYS_CMD_SIZE];
	91	char savesys_cmd[SAVESYS_CMD_SIZE];
	92
	93	/* Do nothing if we are not running under VM */
	94	if (!MACHINE_IS_VM)
	95	return;
	96
	97	/* Convert COMMAND_LINE to upper case */
a0443fbb HB	98	for (i = 0; i < strlen(boot_command_line); i++)
a0443fbb HB	99	upper_command_line[i] = toupper(boot_command_line[i]);
ab14de6c HC	100
	101	savesys_ptr = strstr(upper_command_line, "SAVESYS=");
	102
	103	if (!savesys_ptr)
	104	return;
	105
	106	savesys_ptr += 8; /* Point to the beginning of the NSS name */
	107	for (i = 0; i < NSS_NAME_SIZE; i++) {
	108	if (savesys_ptr[i] == ' ' \|\| savesys_ptr[i] == '\0')
	109	break;
	110	kernel_nss_name[i] = savesys_ptr[i];
	111	}
	112
	113	stext_pfn = PFN_DOWN(__pa(&_stext));
	114	eshared_pfn = PFN_DOWN(__pa(&_eshared));
	115	end_pfn = PFN_UP(__pa(&_end));
	116	min_size = end_pfn << 2;
	117
69ac43b0 CL	118	hlen = snprintf(defsys_cmd, DEFSYS_CMD_SIZE,
	119	"DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
	120	kernel_nss_name, stext_pfn - 1, stext_pfn,
	121	eshared_pfn - 1, eshared_pfn, end_pfn);
ab14de6c HC	122
	123	#ifdef CONFIG_BLK_DEV_INITRD
	124	if (INITRD_START && INITRD_SIZE) {
	125	sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
	126	einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
	127	min_size = einitrd_pfn << 2;
69ac43b0 CL	128	hlen += snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
69ac43b0 CL	129	" EW %.5X-%.5X", sinitrd_pfn, einitrd_pfn);
ab14de6c HC	130	}
	131	#endif
	132
69ac43b0 CL	133	snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
	134	" EW MINSIZE=%.7iK PARMREGS=0-13", min_size);
	135	defsys_cmd[DEFSYS_CMD_SIZE - 1] = '\0';
894e491e HC	136	snprintf(savesys_cmd, SAVESYS_CMD_SIZE, "SAVESYS %s \n IPL %s",
	137	kernel_nss_name, kernel_nss_name);
	138	savesys_cmd[SAVESYS_CMD_SIZE - 1] = '\0';
ab14de6c HC	139
	140	__cpcmd(defsys_cmd, NULL, 0, &response);
	141
583b33bc	142	if (response != 0) {
11af97e1 HB	143	pr_err("Defining the Linux kernel NSS failed with rc=%d\n",
11af97e1 HB	144	response);
583b33bc	145	kernel_nss_name[0] = '\0';
ab14de6c	146	return;
583b33bc	147	}
ab14de6c	148
a0443fbb HB	149	len = strlen(savesys_cmd);
	150	ASCEBC(savesys_cmd, len);
	151	response = savesys_ipl_nss(savesys_cmd, len);
ab14de6c	152
a0443fbb HB	153	/* On success: response is equal to the command size,
	154	* max SAVESYS_CMD_SIZE
	155	* On error: response contains the numeric portion of cp error message.
	156	* for SAVESYS it will be >= 263
11af97e1	157	* for missing privilege class, it will be 1
a0443fbb	158	*/
11af97e1 HB	159	if (response > SAVESYS_CMD_SIZE \|\| response == 1) {
	160	pr_err("Saving the Linux kernel NSS failed with rc=%d\n",
	161	response);
583b33bc	162	kernel_nss_name[0] = '\0';
ab14de6c	163	return;
583b33bc	164	}
ab14de6c	165
b89031e0	166	/* re-initialize cputime accounting. */
1aae0560	167	sched_clock_base_cc = get_tod_clock();
b89031e0 MS	168	S390_lowcore.last_update_clock = sched_clock_base_cc;
	169	S390_lowcore.last_update_timer = 0x7fffffffffffffffULL;
	170	S390_lowcore.user_timer = 0;
	171	S390_lowcore.system_timer = 0;
	172	asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer));
	173
a0443fbb HB	174	/* re-setup boot command line with new ipl vm parms */
	175	ipl_update_parameters();
	176	setup_boot_command_line();
	177
ab14de6c HC	178	ipl_flags = IPL_NSS_VALID;
	179	}
	180
	181	#else /* CONFIG_SHARED_KERNEL */
	182
	183	static inline void create_kernel_nss(void) { }
	184
	185	#endif /* CONFIG_SHARED_KERNEL */
	186
	187	/*
	188	* Clear bss memory
	189	*/
	190	static noinline __init void clear_bss_section(void)
	191	{
229d9c6d	192	memset(__bss_start, 0, __bss_stop - __bss_start);
ab14de6c HC	193	}
	194
	195	/*
	196	* Initialize storage key for kernel pages
	197	*/
	198	static noinline __init void init_kernel_storage_key(void)
	199	{
127c1fef	200	#if PAGE_DEFAULT_KEY
ab14de6c HC	201	unsigned long end_pfn, init_pfn;
	202
	203	end_pfn = PFN_UP(__pa(&_end));
	204
	205	for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
e2b8d7af MS	206	page_set_storage_key(init_pfn << PAGE_SHIFT,
e2b8d7af MS	207	PAGE_DEFAULT_KEY, 0);
127c1fef	208	#endif
ab14de6c HC	209	}
ab14de6c HC	210
fade4dc4	211	static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
92e6ecf3	212
ab14de6c HC	213	static noinline __init void detect_machine_type(void)
ab14de6c HC	214	{
fade4dc4 HC	215	struct sysinfo_3_2_2 vmms = (struct sysinfo_3_2_2 )&sysinfo_page;
fade4dc4 HC	216
27d71602	217	/* Check current-configuration-level */
caf757c6	218	if (stsi(NULL, 0, 0, 0) <= 2) {
27d71602	219	S390_lowcore.machine_flags \|= MACHINE_FLAG_LPAR;
92e6ecf3	220	return;
27d71602 MS	221	}
27d71602 MS	222	/* Get virtual-machine cpu information. */
caf757c6	223	if (stsi(vmms, 3, 2, 2) \|\| !vmms->count)
92e6ecf3	224	return;
ab14de6c	225
92e6ecf3	226	/* Running under KVM? If not we assume z/VM */
fade4dc4	227	if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
d3135e0c	228	S390_lowcore.machine_flags \|= MACHINE_FLAG_KVM;
92e6ecf3	229	else
d3135e0c	230	S390_lowcore.machine_flags \|= MACHINE_FLAG_VM;
ab14de6c HC	231	}
ab14de6c HC	232
fade4dc4 HC	233	static __init void setup_topology(void)
fade4dc4 HC	234	{
fade4dc4 HC	235	int max_mnest;
	236
	237	if (!test_facility(11))
	238	return;
	239	S390_lowcore.machine_flags \|= MACHINE_FLAG_TOPOLOGY;
	240	for (max_mnest = 6; max_mnest > 1; max_mnest--) {
caf757c6	241	if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
fade4dc4 HC	242	break;
	243	}
	244	topology_max_mnest = max_mnest;
fade4dc4 HC	245	}
fade4dc4 HC	246
a3415703	247	static void early_pgm_check_handler(void)
ab14de6c	248	{
ab14de6c	249	const struct exception_table_entry *fixup;
50be6345	250	unsigned long cr0, cr0_new;
eb608fb3	251	unsigned long addr;
ab14de6c HC	252
	253	addr = S390_lowcore.program_old_psw.addr;
	254	fixup = search_exception_tables(addr & PSW_ADDR_INSN);
	255	if (!fixup)
	256	disabled_wait(0);
50be6345 PH	257	/* Disable low address protection before storing into lowcore. */
	258	__ctl_store(cr0, 0, 0);
	259	cr0_new = cr0 & ~(1UL << 28);
	260	__ctl_load(cr0_new, 0, 0);
eb608fb3	261	S390_lowcore.program_old_psw.addr = extable_fixup(fixup)\|PSW_ADDR_AMODE;
50be6345	262	__ctl_load(cr0, 0, 0);
ab14de6c HC	263	}
ab14de6c HC	264
5f954c34	265	static noinline __init void setup_lowcore_early(void)
ab14de6c HC	266	{
	267	psw_t psw;
	268
b50511e4	269	psw.mask = PSW_MASK_BASE \| PSW_DEFAULT_KEY \| PSW_MASK_EA \| PSW_MASK_BA;
ab14de6c HC	270	psw.addr = PSW_ADDR_AMODE \| (unsigned long) s390_base_ext_handler;
	271	S390_lowcore.external_new_psw = psw;
	272	psw.addr = PSW_ADDR_AMODE \| (unsigned long) s390_base_pgm_handler;
	273	S390_lowcore.program_new_psw = psw;
	274	s390_base_pgm_handler_fn = early_pgm_check_handler;
	275	}
	276
14375bc4 MS	277	static noinline __init void setup_facility_list(void)
14375bc4 MS	278	{
3ab121ab MH	279	stfle(S390_lowcore.stfle_fac_list,
3ab121ab MH	280	ARRAY_SIZE(S390_lowcore.stfle_fac_list));
14375bc4 MS	281	}
14375bc4 MS	282
2e5061e4 HC	283	static __init void detect_diag9c(void)
	284	{
	285	unsigned int cpu_address;
	286	int rc;
	287
	288	cpu_address = stap();
	289	asm volatile(
	290	" diag %2,0,0x9c\n"
	291	"0: la %0,0\n"
	292	"1:\n"
	293	EX_TABLE(0b,1b)
	294	: "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
	295	if (!rc)
d3135e0c	296	S390_lowcore.machine_flags \|= MACHINE_FLAG_DIAG9C;
2e5061e4 HC	297	}
	298
	299	static __init void detect_diag44(void)
	300	{
2e5061e4 HC	301	int rc;
	302
	303	asm volatile(
	304	" diag 0,0,0x44\n"
	305	"0: la %0,0\n"
	306	"1:\n"
	307	EX_TABLE(0b,1b)
	308	: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
	309	if (!rc)
d3135e0c	310	S390_lowcore.machine_flags \|= MACHINE_FLAG_DIAG44;
2e5061e4 HC	311	}
	312
	313	static __init void detect_machine_facilities(void)
	314	{
3c7ef08b HC	315	if (test_facility(8)) {
	316	S390_lowcore.machine_flags \|= MACHINE_FLAG_EDAT1;
	317	__ctl_set_bit(0, 23);
	318	}
85e9d0e5 HC	319	if (test_facility(78))
85e9d0e5 HC	320	S390_lowcore.machine_flags \|= MACHINE_FLAG_EDAT2;
14375bc4	321	if (test_facility(3))
d3135e0c	322	S390_lowcore.machine_flags \|= MACHINE_FLAG_IDTE;
14375bc4	323	if (test_facility(40))
23d18e8d	324	S390_lowcore.machine_flags \|= MACHINE_FLAG_LPP;
d35339a4 MS	325	if (test_facility(50) && test_facility(73))
d35339a4 MS	326	S390_lowcore.machine_flags \|= MACHINE_FLAG_TE;
1b948d6c MS	327	if (test_facility(51))
1b948d6c MS	328	S390_lowcore.machine_flags \|= MACHINE_FLAG_TLB_LC;
80703617 MS	329	if (test_facility(129))
80703617 MS	330	S390_lowcore.machine_flags \|= MACHINE_FLAG_VX;
2e5061e4 HC	331	}
2e5061e4 HC	332
61b0b016	333	static int __init cad_setup(char *str)
2c72a44e	334	{
61b0b016 MS	335	int val;
	336
	337	get_option(&str, &val);
	338	if (val && test_facility(128))
	339	S390_lowcore.machine_flags \|= MACHINE_FLAG_CAD;
2c72a44e MS	340	return 0;
2c72a44e MS	341	}
61b0b016	342	early_param("cad", cad_setup);
2c72a44e MS	343
	344	static int __init cad_init(void)
	345	{
	346	if (MACHINE_HAS_CAD)
	347	/* Enable problem state CAD. */
	348	__ctl_set_bit(2, 3);
	349	return 0;
	350	}
	351	early_initcall(cad_init);
	352
761cdf6a HC	353	static __init void rescue_initrd(void)
	354	{
	355	#ifdef CONFIG_BLK_DEV_INITRD
27e7318c	356	unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20);
761cdf6a	357	/*
27e7318c HC	358	* Just like in case of IPL from VM reader we make sure there is a
	359	* gap of 4MB between end of kernel and start of initrd.
	360	* That way we can also be sure that saving an NSS will succeed,
	361	* which however only requires different segments.
761cdf6a HC	362	*/
	363	if (!INITRD_START \|\| !INITRD_SIZE)
	364	return;
27e7318c	365	if (INITRD_START >= min_initrd_addr)
761cdf6a	366	return;
27e7318c HC	367	memmove((void ) min_initrd_addr, (void ) INITRD_START, INITRD_SIZE);
27e7318c HC	368	INITRD_START = min_initrd_addr;
761cdf6a HC	369	#endif
	370	}
	371
a0443fbb	372	/* Set up boot command line */
684d2fd4	373	static void __init append_to_cmdline(size_t (ipl_data)(char , size_t))
a0443fbb	374	{
684d2fd4 HB	375	char parm, delim;
	376	size_t rc, len;
	377
	378	len = strlen(boot_command_line);
a0443fbb	379
684d2fd4 HB	380	delim = boot_command_line + len; /* '\0' character position */
	381	parm = boot_command_line + len + 1; /* append right after '\0' */
	382
	383	rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
	384	if (rc) {
	385	if (*parm == '=')
	386	memmove(boot_command_line, parm + 1, rc);
	387	else
	388	delim = ' '; / replace '\0' with space */
	389	}
	390	}
	391
1fb81057	392	static inline int has_ebcdic_char(const char *str)
684d2fd4	393	{
61fd330d MS	394	int i;
61fd330d MS	395
1fb81057 MH	396	for (i = 0; str[i]; i++)
	397	if (str[i] & 0x80)
	398	return 1;
	399	return 0;
	400	}
61fd330d	401
1fb81057 MH	402	static void __init setup_boot_command_line(void)
	403	{
	404	COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0;
	405	/* convert arch command line to ascii if necessary */
	406	if (has_ebcdic_char(COMMAND_LINE))
	407	EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
a0443fbb	408	/* copy arch command line */
61fd330d MS	409	strlcpy(boot_command_line, strstrip(COMMAND_LINE),
61fd330d MS	410	ARCH_COMMAND_LINE_SIZE);
a0443fbb HB	411
a0443fbb HB	412	/* append IPL PARM data to the boot command line */
684d2fd4 HB	413	if (MACHINE_IS_VM)
	414	append_to_cmdline(append_ipl_vmparm);
	415
	416	append_to_cmdline(append_ipl_scpdata);
a0443fbb HB	417	}
a0443fbb HB	418
ab14de6c HC	419	/*
	420	* Save ipl parameters, clear bss memory, initialize storage keys
	421	* and create a kernel NSS at startup if the SAVESYS= parm is defined
	422	*/
	423	void __init startup_init(void)
	424	{
b6112ccb	425	reset_tod_clock();
ab14de6c	426	ipl_save_parameters();
761cdf6a	427	rescue_initrd();
ab14de6c HC	428	clear_bss_section();
	429	init_kernel_storage_key();
	430	lockdep_init();
	431	lockdep_off();
ab14de6c	432	setup_lowcore_early();
14375bc4	433	setup_facility_list();
a0443fbb HB	434	detect_machine_type();
	435	ipl_update_parameters();
	436	setup_boot_command_line();
	437	create_kernel_nss();
2e5061e4 HC	438	detect_diag9c();
	439	detect_diag44();
	440	detect_machine_facilities();
fade4dc4	441	setup_topology();
7b50da53	442	sclp_early_detect();
ab14de6c HC	443	lockdep_on();
ab14de6c HC	444	}